JP2009275580A - Blower - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slim and highly-efficient miniaturizable blower. <P>SOLUTION: A bell mouse-integrated impeller 1 is formed by integrating an impeller with a bell mouth guiding an air flow to be taken in the impeller. A motor rotatively driving the impeller 1 is provided with a rotor 3 attached to the side of the impeller 1 and a stator 4 attached to a fixed end 7. In the bell mouth-integrated impeller 1, there is no clearance between a bell mouth portion 1a and an impeller portion 1b, discontinuous guiding of the air flow is canceled, and air is prevented from being leaked through the clearance. An enlargement loss is reduced also in the air flow to exhibit high efficiency. Further, property fluctuation caused by the clearance is eliminated to stabilize air blowing efficiency. Since the axial length of the motor is shortened, it is possible to provide a small blower. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a blower as a device for blowing air, or a blower incorporated in a part of equipment as a blower mechanism.

  Conventionally, many blowers have a configuration in which a motor is arranged at the center of an impeller. In the blower having such a structure, a portion for housing the motor is present in the impeller, and this portion becomes resistance of the fluid that flows in, and the efficiency of the blower is reduced. In addition, the inflow resistance can be reduced by reducing the projected area of the motor housing portion viewed in the blowing direction, but as a result, the overall height of the apparatus is increased.

  As described above, there is a difficulty in making the entire apparatus thin and achieving the efficiency of the blower. In addition, it is inevitable that a gap exists between the rotating impeller and the bell mouth fixed to the apparatus frame. Therefore, there is a ventilation leak from the inside of the device to the suction port through the gap portion, which has a great influence on the efficiency of the blower.

  FIG. 8 is a configuration diagram illustrating an example of a conventional blower. As shown in FIG. 8, the blower device includes a bell mouth 8, an impeller 9, and a motor 10. In order to reduce the thickness of the entire apparatus, a housing portion for the motor 10 is provided in an area surrounded by the bell mouth 8. Since the storage portion exists so as to block the suction port, the flow of the airflow is shown as the flow path 11. Therefore, the inflow resistance of air increased, causing a reduction in efficiency.

  FIG. 9 is an enlarged view of the overlapping portion between the bell mouth 8 and the impeller 9 of the conventional blower shown in FIG. As shown in FIG. 9, in this overlapping portion, there is a leak flow 12 as a flow from the inside of the device toward the suction port of the impeller 9 without passing through the bell mouth 8, which is one of the causes of deterioration of the blowing efficiency. It was.

  FIG. 10 is a configuration diagram of an embodiment of a blower device proposed by the present applicant in Japanese Patent Application No. 2006-299752 which is a prior application. As shown in FIG. 10, a bell mouth 8 for sucking air and an impeller 9 are provided, and a rotor 16 fixed to the impeller 9 and a stator 17 fixed to the bell mouth 8 are interposed between them. The motor which consists of is arranged. A bearing 15 is disposed between the bell mouth 8 and the impeller 9. The bearing 15 is a type of bearing having an inner ring radially inward of the impeller, an outer ring radially outer, and rolling elements between the two rings, and the inner ring is fixed to a bell mouth 8 that wraps around the bearing. Is fixed to the impeller 9. By means of the bearing 15, the impeller 9 can rotate relative to the bell mouth 8.

  FIG. 11 is an enlarged view of the overlapping portion of the bell mouth 8 and the impeller 9 of the blower shown in FIG. As shown in FIG. 11, since the bearing 15 is disposed between the bell mouth 8 and the impeller 9, the air flow path 11 is distorted by the step 22 corresponding to the thickness of the bearing, and the expansion loss, That is, a loss occurs when the air flow spreads.

  A rotating shaft of a magnetic rotating body that serves as an impeller of a magnet pump is attached to the center of a cross-shaped shaft support member installed in the pipe, and magnets with alternating magnetic poles are arranged on the outer periphery of the magnetic rotating body. An induction rotation drive unit that becomes a stator of the motor is arranged outside the pipe, and the magnetic rotator is driven to rotate by the rotating magnetic field generated in the induction rotation drive unit. The magnetic rotator is subjected to centrifugal force at that time. There has been disclosed a fluid-axis particle pressure feeding device in which centrifugal flow paths in which pressure is generated are provided axially symmetrically and guide vanes are provided on the exit side of the impeller (see Patent Document 1). Moreover, although it is an air blower provided with an impeller, the stator which integrated the bellmouth which supplies air to an impeller, the rotor of a motor is attached to an impeller, and a motor is fixed to the side which fixes an air blower. The thing which has arrange | positioned the child is proposed (refer patent document 2). Further, a plurality of blades are provided on a rotating shaft to form a windmill, and a rotor is formed by attaching a plurality of permanent magnets to a ring attached to the outer periphery of these blades, and surrounds the windmill at the end of the air intake side. A wind power generator is disclosed in which a cylindrical casing having a bell mouth is provided and stators are radially formed on the casing along the outer periphery of the blade (see Patent Document 3).

  However, in the fluid axis particle pressure feeding device disclosed in Patent Document 1, the guide blade is not an integral structure with the magnetic rotor that is an impeller. Further, even those disclosed in Patent Documents 2 and 3 do not disclose a structure in which a bell mouth and a rotor are integrated with an impeller.

In the conventional blower, it is difficult to improve the efficiency of the blower due to the suction resistance of the motor housing and the leak from the inside of the equipment to the suction port, and the motor is located in the center of the impeller, so the whole blower is thin. It is difficult to reduce the size of the air blower by making the motor thinner, so there is a motor housing part in the center of the impeller, so both high efficiency and low noise are achieved. It was difficult to do.
JP 2000-274398 A (FIG. 3) Japanese Utility Model Publication No. 62-184194 Japanese Patent Laid-Open No. 11-299197

  Therefore, there is a problem to be solved in that the air flow guide discontinuity between the bell mouth that guides the flow of air to be taken in and the impeller that draws in and sends out air is eliminated, and air blowing efficiency is improved.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a high-performance blower that can constitute a blower with high efficiency, thinness, low noise, and stable characteristics in order to solve the above problems.

  The blower according to the present invention includes an impeller, a bell mouth that guides the flow of air sucked into the impeller, an annular stator that is fixed to the apparatus frame side, and an annular rotor that is attached to the impeller side. And the impeller is a bell mouth integrated impeller integrated with the bell mouth, and the annular rotor of the motor is attached to the bell mouth integrated impeller. It is characterized by that.

  According to this blower, since the impeller and the bell mouth have an integrated structure, there is no gap between the impeller and the bell mouth. Accordingly, the air flow guidance discontinuity is eliminated, and no air leaks through the gap. In addition, when the impeller and the bell mouth are configured separately, a gap between the two is formed in the radial direction, or a bearing is disposed between the two, and an expansion loss occurs in the air flow accordingly. By integrating the impeller and the bell mouth, the expansion loss is reduced and the efficiency is increased. Furthermore, since the characteristic fluctuation due to the gap is eliminated, the blowing efficiency is stabilized.

  Moreover, according to this blower, since no radial gap is formed between the impeller and the bell mouth, the motor stator and rotor can be increased in diameter accordingly, and the larger diameter can be achieved. Accordingly, the stator and the rotor can be thinned in the direction of the rotation axis. By reducing the thickness of the motor, the entire blower can be reduced in size. Further, the impeller can constitute a blower device in which the bell mouth and the motor are integrated, and the assemblability can be improved.

  Furthermore, according to this blower, since the motor housing portion can be eliminated in the central portion of the impeller, the portion that becomes the inflow resistance is eliminated, and the noise can be reduced.

  As described above, in the blower device according to the present invention, the impeller and the bell mouth that guides the flow of the intake air to the impeller are integrated, and the motor is disposed between the side that fixes the impeller and the blower device. Therefore, the air flow guide discontinuity between the bell mouth and the impeller is eliminated, the air blowing efficiency is improved, and the air blowing device with high efficiency, low profile, low noise and stable characteristics is constructed. And a high-performance blower can be obtained.

  Hereinafter, embodiments of a blower according to the present invention will be described with reference to FIGS. In each embodiment, parts and parts having similar functions are denoted by the same reference numerals, including those used in the conventional blower shown in FIGS.

  FIG. 1 is a longitudinal sectional view showing Embodiment 1 of a blower according to the present invention. As shown in FIG. 1, the air blower according to the present invention includes an impeller 1 in which a bell mouth that sucks air is integrated, and a motor that rotates the impeller 1. The motor has an annular rotor 3 fixed to the impeller 1 side and an annular stator 4 fixed to the apparatus frame side. A bearing 5 is disposed between the bell mouth integrated impeller 1 and the fixed end 7 of the blower, and the bearing 5 can rotate the impeller 1 inside the fixed end 7 of the blower. Yes. When the impeller 1 rotates, air is taken from the suction port 2 and blown.

  The bearing 5 includes an inner ring 5a on the radially inner side, an outer ring 5b on the radially outer side, and a rolling element 5c such as a ball disposed between the two wheels. The inner ring 5a and the outer ring 5b of the bearing 5 are respectively arranged corresponding to the rotor 3 and the stator 4 on the air intake side of the motor. The end portion of the bellmouth integrated impeller 1 is attached to the outer side of the inner ring 5a, and the impeller 1 is located along the inner side of the rotor 3 at a position facing the side surface of the stator 4 on the air delivery side. It extends to. The bearing 5 allows the bellmouth integrated impeller 1 to rotate with respect to the fixed end 7 and the stator 4.

  FIG. 2 is a top view of the motor unit in the blower shown in FIG. As shown in FIG. 2, the rotor 3 is provided on the inner side, and the stator 4 is disposed on the outer periphery thereof. A bearing (indicated by reference numeral 5 in FIG. 1) is arranged at the top of the motor, the inner ring side of the bearing 5 is on the impeller 1 and the rotor 3 integrated with the bell mouth, and the outer ring side of the bearing 5 is on the stator 4 and the blower. The fixed end 7 is fixed. A plurality of coils 6 are arranged side by side in the circumferential direction on the stator 4, and the stator 4 can generate a rotating magnetic field by controlling excitation of the coils 6.

  FIG. 3 is a longitudinal sectional view showing Embodiment 2 of the air blower according to the present invention. The air blower shown in FIG. 3 includes a bell mouth integrated impeller 1 that sucks air and a motor that rotates the impeller 1. The motor has a rotor 3 fixed on the impeller side and a stator 4 fixed on the blower side, and the structure is the same as in the case of the first embodiment. A bearing 5 is disposed between the bellmouth integrated impeller 1 and the fixed end 7 of the blower so that the bellmouth integrated impeller 1 can rotate with respect to the fixed end 7 of the blower. It has become.

  The bearing 5 in this embodiment includes an inner ring 5d on the inner side in the axial direction, an outer ring 5e on the outer side in the axial direction, and a rolling element 5f such as a ball disposed between the two wheels. The inner ring 5a of the bearing 5 is arranged corresponding to the stator 4 on the air intake side. The end portion of the impeller 1 integrated with the bell mouth is attached to the outer side of the outer ring 5e, and the other impeller 1 portions send out air along the inner side of the rotor 3 as in the first embodiment. It extends to a position facing the side surface of the stator 4 on the side. The bearing 5 allows the bellmouth integrated impeller 1 to rotate with respect to the fixed end 7 and the stator 4.

  FIG. 4 is a longitudinal sectional view showing Embodiment 3 of the air blower according to the present invention. The blower according to the third embodiment shown in FIG. 3 includes an impeller 1 in which a bell mouth that sucks air is integrated, and a motor that rotates the impeller. The motor has a rotor 3 fixed on the impeller side and a stator 4 fixed on the blower side. Other structures. The structure is the same as that of the first and second embodiments. An impeller support shaft 21 is provided at the center of the impeller 1, and bearings 5 and 5 are disposed on the impeller support shaft 21. Each bearing 5 has an inner ring 5g, an outer ring 5h, and a rolling element 5i disposed between the two rings. The outer ring of the bearing 5 is provided with a foreign matter inflow prevention wire mesh / impeller support portion 20.

  FIG. 5 is a top view of the fourth embodiment shown in FIG. On the air intake side, a concentric wire mesh is provided for preventing foreign matter inflow. For the purpose of supporting the wire mesh and the purpose of supporting the impeller 1, a plurality of support portions 20 are arranged extending radially from the center of the blower toward the fixed end 7. The bearing 5 includes an inner ring 5g attached to the impeller support shaft 21, an outer ring 5h attached to the support portion 20, and a rolling element 5i disposed between the two wheels. That is, the bellmouth integrated impeller 1 is rotatably supported via the bearing 5 and the impeller support shaft 21 at the center portion of the support portion 20 that supports the metal net for preventing foreign matter inflow.

  FIG. 6 shows the flow path 13 of the air flow in the air blower of Example 1 shown in FIG. 1 as a streamline. As shown in FIG. 6, since there is no motor storage portion in the central portion of the impeller 1, there is no factor that increases the inflow resistance of air, and the efficiency can be improved by about 4% compared to the conventional product. .

  FIG. 7 is an enlarged view of the bell mouth integrated impeller 1 and the fixed end 7 of the blower in the blower of the first embodiment shown in FIG. A magnetic gap 14 and a bearing 5 between the rotor 3 and the stator 4 exist in a leak path from the inside of the device toward the suction port of the impeller 1. Usually, the magnetic gap is as narrow as about several millimeters, and there is a distance corresponding to the thickness of the motor, so that the structure is less likely to leak compared to the conventional product. Further, the bearing 5 exists outside the device, and the structure is further less likely to leak. Further, by using a bearing with a seal for the bearing 5, it is possible to further prevent leakage. Therefore, a highly efficient air blower can be configured with less leakage compared to conventional products.

  In the conventional air blower, as shown in FIG. 11, a step 22 between the bell mouth 8 and the impeller 9 occurs, and an expansion loss occurs as a flow path. In the blower according to the present invention, the impeller is an integral impeller 1 in which the bell mouth portion 1a and the impeller portion 1b are integrated as shown in FIG. The step 22 that has been generated does not occur, and the expansion loss in the flow path of the expanding flow can be reduced.

  Moreover, in the conventional air blower, as shown in FIG. 8, since the motor 10 exists in the center part of the impeller 9, there is no direct air flow on the motor 10, which is disadvantageous for cooling the motor 10. It was a structure. However, since the rotor 3 is being fixed to the impeller 1 as shown in FIG.1, FIG.3 or FIG.4, the impeller 1 has a role of the heat radiator of a motor. .

  The blower according to the present invention is useful as a blower that requires an air volume, such as a ventilation fan or a cooling / air-conditioning blower.

It is a block diagram which shows Example 1 of the air blower of this invention. It is a top view of the air blower shown in FIG. It is a block diagram which shows Example 2 of the air blower of this invention. It is a block diagram which shows Example 3 of the air blower of this invention. It is a top view of the air blower shown in FIG. It is a figure which shows the air flow in the air blower shown as FIG. It is an enlarged view which shows the motor part of the air blower shown as Example 1 in FIG. It is a figure which shows the form of the conventional air blower, and the flow of air. It is an enlarged view which shows the overlap part of the bell mouth and impeller of the air blower shown in FIG. The form of the conventional air blower and the flow of air are shown. It is an enlarged view which shows the overlap part of the bell mouth and impeller of the air blower shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Bellmouth integrated impeller 1a ... Bellmouth part 1b ... Impeller part 1b
DESCRIPTION OF SYMBOLS 2 ... Suction port 3 ... Rotor 4 ... Stator 5 ... Bearing 5a, 5d, 5g ... Inner ring 5b, 5e, 5h ... Outer ring 5c, 5f, 5i ... Rolling element 6 ... Coil 7 ... Fixed end 13 of air blower ... Air 14 ... Magnetic gap 20 ... Foreign matter inflow prevention wire mesh / impeller support portion 21 ... Impeller support shaft

Claims (6)

An impeller, a bell mouth for guiding the flow of air sucked into the impeller, an annular stator fixed to the apparatus frame side, and an annular motor having an annular rotor attached to the impeller side And
The blower characterized in that the impeller is a bellmouth integrated impeller integrated with the bellmouth, and the annular rotor of the motor is attached to the bellmouth integrated impeller. The blower device according to claim 1,
The air blower characterized in that the bellmouth integrated impeller is rotatably supported by the device frame by a bearing disposed on the air intake side of the annular motor. In the air blower according to claim 2,
The bearing has an inner ring disposed radially inward corresponding to the annular rotor, an outer ring disposed radially outward corresponding to the annular stator, and a rolling element disposed between both wheels. The air blower characterized by performing. In the air blower according to claim 2,
The bearing has an inner ring arranged on the inner side in the axial direction corresponding to the annular stator, an outer ring arranged on the outer side in the axial direction, and rolling elements arranged between the two wheels. Blower device. The blower device according to claim 1,
The bellmouth integrated impeller is attached to an impeller support shaft that is rotatably supported via a bearing at a central portion of a support portion that supports a wire net for preventing foreign matter inflow. Blower device. In the air blower of any one of Claims 1-5,
The bell mouth integrated impeller covers at least a side portion of the annular rotor on the air intake side, extends along the annular rotor toward the air delivery side, and further extends on the air delivery side of the annular stator. An air blower characterized by extending to a position facing the side surface.

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